Fluorescence kinetics for upconversion enhancement of Er3+/Yb3+ doped oxyfluoride glass ceramics by K+ ions doping
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View abstract on PubMed
Summary
This summary is machine-generated.This study enhances upconversion luminescence (UCL) in oxyfluoride glasses by co-doping with K+ ions, significantly boosting violet, blue, green, and red emissions. These enhanced glasses show potential for solid-state lighting and fluorescence thermometers.
Area Of Science
- Materials Science
- Luminescence
- Nanotechnology
Background
- Upconversion luminescence (UCL) in oxyfluoride glasses is crucial for optoelectronic applications.
- Doping with rare-earth ions like Er3+ and Yb3+ can enhance UCL, but charge imbalance and lattice defects can limit efficiency.
- Potassium (K+) ion doping is explored as a method to improve the structural and optical properties of these materials.
Purpose Of The Study
- To develop novel oxyfluoride glasses embedded with β-PbF2:4Yb3+/1Er3+/xK+ nanocrystals (NCs).
- To investigate the effect of K+ ion co-doping on the upconversion luminescence intensity and properties of β-PbF2:Yb3+/Er3+ glasses.
- To explore the potential of these materials for temperature sensing applications.
Main Methods
- Conventional melting-quenching method for synthesizing oxyfluoride glasses.
- X-ray Diffraction (XRD) and Energy-Dispersive X-ray Spectroscopy (EDS) for structural and compositional analysis.
- Upconversion luminescence spectroscopy to measure emission intensities and analyze energy transfer mechanisms.
- Rate equations analysis to understand the role of K+ ions in radiative transitions.
- Temperature-dependent luminescence measurements to evaluate sensing performance.
Main Results
- Co-doping of Er3+/Yb3+ and K+ ions into the β-PbF2 lattice was confirmed, substituting Pb2+ ions.
- K+ ion doping effectively eliminated charge imbalance defects and reduced lattice distortion, leading to a significant increase in UCL intensity.
- The β-PbF2:4Yb3+/1Er3+/7.5K+ glass exhibited maximum UCL enhancement (42.7-109.5 times) across violet, blue, green, and red emissions.
- Violet UCL was utilized for temperature sensing, achieving a maximum relative thermal sensitivity of 1.47 % K-1 at 300 K over the 300-500 K range.
Conclusions
- Synergistic effects of K+ ion doping in β-PbF2:Yb3+/Er3+ glasses significantly enhance upconversion luminescence.
- The enhanced UCL and demonstrated temperature-sensing capabilities highlight the material's potential for solid-state lighting and fluorescence thermometry.
- K+ ions play a pivotal role in charge compensation and lattice distortion, optimizing radiative transitions for improved luminescence.
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